That looks like the Paratrooper Model carbine. Pre-assault weapons ban, a buddy of mine knew a FFL that got us each one of us one of those and a case of Chinese 7.62x39 steel case ammo to split. We each paid right around $100.
When the guns came in we went out to a creek on my buddies property to test fire them. My buddy's worked fine. Mine fired a three round burst and the trigger stuck back. I pushed the trigger forward and the gun fired again. I pulled the trigger again and another three round burst came forth and the trigger stuck back. From there I unloaded the weapon.
I ended up disassembling the thing using a nail as a pin punch, and found a loose piece of metal wedged in the trigger group. Removed the metal, reassembled, and everything has worked fine since.
There is nothing like an experience like that to reinforce the rule that guns should always be pointed in a safe direction. SKSs do not have modern safety mechanisms, so you need to be doubly careful with them.
I love mine, it has the same length of pull as my 45 year old Daisy BB gun. Although the sights on my Daisy are far superior the SKS has a power advantage.